1)4,5*5,4-6,1=18,2
2)x^2+2x-24=0
D=b²-4ac, D=2²-4*1*(-24) = 100=√100=10
x=-b±D/2a, x1=-2-10/2=-6; x2=-2+10/2=4
x1=-6;
x1=-6;x2=4
